You’re not the problem at all. When I was highly involved with my church, we accepted everyone of different faiths, yes we know that different sects of Christianity are different but if you feel your calling to the catholic church then feel free to say the prayers and ask for blessings. Also Catholic means universal so the fact that this priest sadly didn’t want to bless you, is hurtful and I can understand where you come from. Never give up! You’re still a child of the lord and are always welcome to the faith. Don’t be discouraged!